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Cash and cash equivalents (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Bank accounts | $ 29,540,020 | $ 21,918,298
Short term deposits | 13,362,649 | 9,419,179
Total cash and cash equivalents | 42,902,669 | 31,337,477
United States dollar [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Bank accounts | 16,107,831 | 11,797,054
Short term deposits | 11,100,185 | 8,379,723
Cayman Islands dollar [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Bank accounts | 6,690,274 | 5,626,487
Short term deposits | 1,209,954 | 0
Bahamian dollar [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Bank accounts | 6,353,936 | 3,301,002
Short term deposits | 1,052,510 | 1,039,456
Belize dollar [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Bank accounts | 0 | 1,130,783
Bermudian dollar [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Bank accounts | 3,084 | 3,370
Mexican peso [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Bank accounts | 384,895 | 37,313
Indonesian rupiah [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Bank accounts | $ 0 | $ 22,289

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631418-115840 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631419-115840 + Details
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